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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ced131109ab9290159e832dec2440b5d32d1d5ea383e4915e92c64d18bea1979' 
  AND token = 'znJOYeST7QAvXE31Ow3cKy5fZPuV0eB4Hx9KP2KHDCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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