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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e5764ee8bba96e169cbf25222a6878899374084d916a5adc239256f24d6b8f08' 
  AND token = 'ty/AFZAoccJeaeQxy6B+ECAFrURlU4St/+VFuA8HrF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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