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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7e3082056fe0cc41c7032b66f53214b6d32d051f185021e6df0d63c8f5c7a5b6' 
  AND token = 'b0bdLdHuiVTWIjRsXvKCET4z/DDn8eU9kv0Ezi4mOaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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