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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '08d0605f211c952fe78cc716f6f6bf11828179bdffb1b2d1a6cf5f4d2c5408fe' 
  AND token = 'VEkojyUYRSA+hw06M4eoJczrtsMPBOXbF0Albsrbu7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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