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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7de04e7d55025bb6642d2cf8f1283a255f9d293b36bdbdf88d632028c4f98a58' 
  AND token = 'D78DojQA6MQMK/Msh+Lpc71F5MCmTY7PDEeCTux36Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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