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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '131a0de052b18418d53688f9e7a234c8a4c54b6f47277ce8cdaa3e912169466a' 
  AND token = 'J6J7bVH475Bi1Xfqsprqzga24SzasaIz6KhkMuYp7qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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