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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd754bf1e456048bdae04cbe0e954b2ac4da8624fd2d5d0f6e589668e229b0ffe' 
  AND token = 'SIDy/WjqDe2je4lltuoZJ1eIc9f/Wr6NEnrsMWlzZ0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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