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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd1238d0ac269b6a98620b9579e78f39720cd55d62e7a15166c74a9af4ffa901e' 
  AND token = 'Q0fCZdlCalmtHrBkD4rJtiNnyVZhTCk5a/gC2qnH9Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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