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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1810b22cdbb766dd732ab1113bba1108ff5542ee469bc3cb0e95aee7fe24b404' 
  AND token = 'ow9s8aBlKmTy6uSJSa1jEzxrbDjml89YrRL3moB0Zmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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