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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fcc38da9ea90ef8b9144dabd6f56fc96da86d5e1c39e0f156e376bf1b4563f9d' 
  AND token = 'YzT7QT3JtDOm8U5sVuKyOUvH7vV/glHu6Ntk3C4qDrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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