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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '57fc254d2e17115e5b7ec726cbafbfb37602b882a9b26a64d3155cecc6e8c0b2' 
  AND token = 'gVw3dzkdveviUWV2UFavT8uwlmRPAX7fjEhlSP1zqTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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