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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6d58c01d56ece0d8f7746fbeb68054462eac5dd39008c98e4a3a82eb27e9b0c7' 
  AND token = 'z2k7Zd6/0XJSOaeQbb8QKxsYE9G5mSqJa5OHGahFTTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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