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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'acc807967f23ca3deb79564e822e31f2edf055407899133b4dce04f9241ff67f' 
  AND token = 'hH+XUTrtX5RL78p0WiDcluJRLYo8/76Oav+inlqnmhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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