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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd6213ec2d2ba811fc10c4c118dca39a5d15fa2899afbc14c8b874cee4f726db2' 
  AND token = '+uZi0VubMNFNsGnfYq1mp8Kcv/i4sRqPqHBkucw/t4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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