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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4b9845cd58d1cc145abdf7ab5fca85d8238a83a47a3fff7cfaeaa987f1c9f894' 
  AND token = 'XA3GfxNogdW0FJUWYSbtGoQ/09mz2/E//fz4y3nzvmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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