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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8667b0ae246ef8c04b386ec05593e581d971b46221532703f1d1758b9250239f' 
  AND token = 'y6BaVMkxfH8+K+q0N9YhXac3OOOoOdRDutOdyVnEyhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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