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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0a571a648cf8a8f04b597ec1eb0c750e84b10f7d6efcbcd0006dd020cb4f0e54' 
  AND token = 'ZgjIN4WMcFH6X/p2cU9OK0t/g+AO0BSdQnTy72+j6zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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