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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5ca5279454cab5d5b08d325d9dd418218ca20dfbedb2649432e27e17c2bd3fd9' 
  AND token = 'MxDcflk6xacVXzI8dqUndiQ7u0vLDW4yPRP/oV7dwNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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