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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '219eb71d851a54fde53dca40e17b9513d444cc530ffe401afc391c2b73ad9d71' 
  AND token = 'jHY+HB/uMc2fN531CLbohKhSLzLSbHI2d8Sbi6NASSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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