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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6b3c2aa6cffe6c4269a25117496f2b457dbb4ee6ae43c7911c816c33cbecb3dd' 
  AND token = 'AOChDa5a9dJ3HQX0PL3lR5ZK31xmLqt3nt9dO6gO03Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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