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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6a13dde1c189eae8b411783cb17285af865753090435f7abb4f4770177f7e2ff' 
  AND token = '/TwX47i49xFQfU963lk2PEpft3BdJym55QDhlXfBRLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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