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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e4ef4195320b2c94b624cded5c26ae8b9091e6307e31faa6241330b5bd5692a1' 
  AND token = 'Ty+EmLv6gePkMK2bWHXkNNxdXIvMMSchnT1OzeT62rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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