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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '770af9fd52cdfef6e98f3d9f61d8a6323f89d9b252a01f41e3172e9c06ff4168' 
  AND token = 'BD59EA7Pcg4DSWUVIjkb5mCy35DncP0Pd4rKPMlGBPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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