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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bad9c40d93c256bca9141918bf20700f6fe5d9d3930ec5d5e4feb546bd6f9444' 
  AND token = '1qAknn95udcc3/W2e6E8UapsBOAv8wcbfpezh0wvBCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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