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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8ca62f919b1e9548c73500f1222b6133011335986d68f68351bb78e6b250d7b5' 
  AND token = 'kiYjwOCApEGaR0YXokYYGLNYc4k60Tfogke7kJK6KaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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