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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f66faae3b3a3410eaa4f99c4d44cd0d1a2beaa490e4522e2a04112f27b278a5c' 
  AND token = 'S4ncxU9bIK34rklX6w2zp/eyf7g1PUPCbSk/kTZ28OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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