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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '85eaae5d3f6f6388ac0b9708ceb8ab828b9f92416cbd48422eac4e4f295d6cd2' 
  AND token = 'bHPRPSWPSIbzlWbdiMZb6CJ5fSWjdGNrQ3lXQU0mRe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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