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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '81791fcdda815a8434476572a97a1e38e21f363e0659f4e17f4a8a0a6ec43197' 
  AND token = 'RK8vb1eIPmN0vkb1fKiK8TCLiNfgulunIh7z0wgAHAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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