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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e8ec08069f10a1f38a186ef34430a7d638676a79d0e16bd8cdd0df22ab2000d' 
  AND token = 'ak67F8ns3Ty8VLmkk6tI5vD8hKBWJ33SuwT+mc147oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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