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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fe45d1ded09f4ab098e8fa327514dc393bf60e802e39e9c8301a2fa344f32321' 
  AND token = 'pI764bQ+far5UAspt7c8RgP6VCIDEVAq2rP0+TkCeTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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