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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f56dc627ae1d71b5b90f3896526b3ef6516cc5d14699ddf151a6096680a3ee3e' 
  AND token = 'XSBRRde6Ctp2PFv5zGuF21FBgLgtU+WsPfAuYA/E70I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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