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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ebb736402efcc93b909dc3446e7a42d73abeea8f5a4ce8ed1bd2fef124d98ab8' 
  AND token = '1uC1ZlT3L/LXjsg/LOnCdGy7a16kwp8fgmxj8HA46q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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