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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '030f7fe61fe91701ccf2db1433dce50f98ea808a4d9f3312105667b9021f8b6b' 
  AND token = 'R5bygDT4j33y8t+fQxOWrso24zkNpgBybWudAkSTNkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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