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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd1c484174a2132044cb3dcfd5ef2546f83ca6e1acf5894e84f65884881868f15' 
  AND token = 'YQPJPVIedD+VLaS8YzTM52YD5jXyJTA0i6bnFdz8YYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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