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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a6f5f38b0dc0a21a4ae0aa3ceea41e22dda2ed9e3ca16aeb9495e94cb0ae46b6' 
  AND token = 'Zc9/RIIhIyR1CBB1wTPwNHCajMCa33o9zEnkycRhxnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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