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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd37125f9891a8c107bb4e16efef80a761c4878d0ef5f3839d522ed8b6b092081' 
  AND token = '5Mn5ELpVaXUKgZbiBbXD5sXRZJepRF1ublni+SZdSKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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