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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '805aadac8092dfc37a172d2329f3894e3397f5ecb8dde945bcb2292f1c85b2e9' 
  AND token = 'rFFzcLod3Az9qnHHYT38ar7unmodH/wo73kzK0NCrgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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