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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ae9d033adc747d62d8be6f7b7c42f847a833a20c65e37867b038bf3da7c0fb0e' 
  AND token = 'gTJk4APyqtM4hD3wywIM+ql8F/2uvPS7hyeorKvLCM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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