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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c281fc2aeeef07f28c17417c2c6f807f9419be09e1825abb61a412091625cdcf' 
  AND token = 'ZWfzSLQA1DrBy29vfNKhOjj1byoSKsc+jqqchO4Y31c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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