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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd160c713eb29c91b535fe84f1d4b94e2681463d3cdd804b7070aac044de80931' 
  AND token = 'zLBRlCYhYQoxA61IahPPvSs/15CTvs1jWogI9xca6s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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