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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '862a70d3d19acda20bdbd6aaedb581f8784e2cd7fcad4e429dad1666580eebe7' 
  AND token = '6aV2/SpFXf7O3e4FHKNT57n/8DQZDiSyxmB8BniDLF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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