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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e5f463bf1f43e34d619b5fa5e7cae333aaf284fb5fd249d9f54ef660b3390da' 
  AND token = 'T8dT4E/KtH2uHnojR9WLvD0oojYN0tcVqR+8Vf7qXKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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