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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6af736cb93048cff36457d19803e4ab2a05474caaf05fd16ffe86b61f7ad3ab8' 
  AND token = 'G5pFutdyFBMTAu9NVlMD+Vk06AFTYFdWOWLTYDUVonI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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