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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '84903f1ed62f9af5612f2d454ed6669546068fc741ad6c5aa994e0c9495533aa' 
  AND token = 'Fz7WXngoFpwNuAigO1rN3xsegNc9JxUZ++gAU57ND/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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