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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '39d8c0a943a4e0e9b19c08b16e33bb123f82265abdd68dc21a1a03dded34f7f9' 
  AND token = 'ZwctNYHEvm6kO1bdAwp/55+z0/8L3YwPQE3m6EuMr40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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