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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3c40dab39df0a9a3c57147daca365329b41fdebe6b3cfd2edf91bc99ac84c095' 
  AND token = 'zKbmJRKFg5w+MS8eenPqSnBMywK3e6BiMjFikBCHxLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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