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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9208606fd35c6fd7ac3e9f4a7263177ec90b1a30c8230164819651aeaf8569e3' 
  AND token = 'OYsOO7F73RZ0Xflac6agCCkQk1R4tGIeALSra1xUFoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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