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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ef993e43333d40abdbea0b15489d137cda67af3a4c3fbeb363db99a5ecde055c' 
  AND token = '7O2M6EUMHeAdoXGdC7AJhr+TTDnlEMY/HiCwdaVPD6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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