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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5b2afcdd4c222c629bde48bf82bab2ff7747e320e2bb4f50c51ef9dc19f4d6db' 
  AND token = '7+QtN8cdeO9K4+7FF2mlnCFP6STs1hIGLNK1t/znhLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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