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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e1bf1908295ad12d9f18bf614e3bf2b759b94be43878b95fef3a180cfea5d8b1' 
  AND token = 'AYQ9paIpruw/sH3rUEk1P2CN6en83Km4FBI0yFnbza0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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