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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7e9a90acc6b6ebdc842ff306098ff414e153b2ed5ed5b3f1ea70b1312a6ecbdc' 
  AND token = 'T7QEWSDgjRbZS5fU80dp5TgYGmtymafq3bIVFQHhyns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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