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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3efb8fc0b14cc8a0f6054576e7f867e0e7ca57f345d6482f9c2679ea56979316' 
  AND token = 'IIppq4aNJg+0eZuNLJWwQP14NS7ALfY5otb4MPe2Jrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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