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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4e11c5c3d4bade5ffa3ab060706391e6a8cca31a9e526e226a20953d95f45bee' 
  AND token = 'ID3q8y3aTn/aqGvu7Firrc12+EGlImUAPc+ZGSA+Etg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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