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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e35853852bf4c1402514cff478e8772948eee255f8a114375277245ba1b5fc8a' 
  AND token = 'LVMiTgPAFCUrYgp7jADFhnYpO/LRqZSQjuB74Y/YPes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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