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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '87f9fa3b431343e1dc5591c7e4a1813c18f778df67b55bf19d80640d750ebc50' 
  AND token = 'IxF70grqS4sX1BXoDEOo+pHjeDqXh2eQZXve1n6H7yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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