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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f2978406704f60d8b7a6ba808f61ef10739a41593232f947b7df057397c2f67c' 
  AND token = 'Ua9EMBnUYeAsplobkYmXA1chYGmZVdVT6dBn7OrleOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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