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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '18dc273f52e6535b81d7bf60ff35f095caee592bccba3fdc17c513c110f64063' 
  AND token = 'xXnVVz+AH0hcb+iGLq4yDhdOVISqttShUeAStS/iPKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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