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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b7b7bdfb42a45b9e28525a301fd216231c8e16c1afba4c3fcd4167f1f930f1c6' 
  AND token = 'enBCcCu5TT6XB8Ru7l5ji/EbdI8MpIMWgqcoey8Mz80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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