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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8f20de98283a3081f11048a6a1358f4f58917eba93a63450580086b77a12e483' 
  AND token = '5Cu05l48ErYFOcj1BMJh+xRfbFVFVoMnNRnBOpyFLQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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