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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7d560ba9b6426313f08ef1a2db875b8bb554c2f3368d9be87ba260fc786b55ba' 
  AND token = 'UR1PtIArRQWMk7Bq677P1Q7DnG8D3G4Bt7BH0TLWa5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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