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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a4a51c4dbc360860a58f7bc8c2aa06fb4315a008962cc5dfe700e7a1f9c6d4c1' 
  AND token = 'peaQaIKJLBb6lbqNUlFu0DLtJSTM0Qe/mNPdex5O8tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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