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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0bb126e12ced8a52b7be1cc18da823092fb73a29704be6fc7197d7f546d08b78' 
  AND token = 'MbeSMMftcQV04mPdk7drPXUtUE+2gLFtqf5jZ2/J3HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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