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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b73112a68cc1862e6f16402a19b796494ccdc4dd12319559a73dd8dacbbb7040' 
  AND token = '5iHNxXfso3lt23gs3qeCuEUWBinDNv7Lq7xKQf6za5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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