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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f08f3f1ac52b0bb9bd0e833a74cc38daaa2cd2f9362cc66fcb2812924001567a' 
  AND token = 'gI65soLpl/2IsAWdC52MjI67Jn0EoPVF+3wD5888CiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}