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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '960a713d4f0daaf88c487bbd921e3fd8e2de4e31618e1201fec0466ef23de004' 
  AND token = 'NvVI8dwBM+N0fG3hHtX4SvN1IE9NBbL21rgKRPMR3UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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