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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0afb848047e054fec8207e51d9bdac9d25e6f2e3b87effe83461cc54124c669f' 
  AND token = 'aNB8pWwg/O96ayiMEp3J05pZ3Y9Lbe9u+XwAQsKz31A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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