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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f32c2a8c41457a7dfa231c3ef305f2f5881ec04fa5c510380db4802010a5ad12' 
  AND token = 'cdJJ8g6foyY6YINUPb+nIi0RXa1er9Ak7fhUBV2vTd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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