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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '59a4a6ce05dbb1ef56b102d1bfba5daa2b87f0d3a6dcf765f3a278c0d16dc46e' 
  AND token = 'klZ1oFx7M1Re+0MB4Ftn53GPTXn8fKC2FNWJXcjtMLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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