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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e923f5914a95354cc1422eec72517f90ab1fc694ac7be995ae22bc58e4e9598c' 
  AND token = 'Ee7VQOZvJpDGvK3LyKvxB7tdxf/EHGcgpSM+Muqo6yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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