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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6027bb0ac2fc9647f7e373bc2a3ac317547f75a8034d7c4e7e23aee6e68fc011' 
  AND token = 'Q72CbyPmEySPmcicXuJcAMkN5jyyWcrt5Wp9kza7X2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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