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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '755c46c143fec30da2bdffe92da31e67da985e220d596fa14443686faf1464b3' 
  AND token = 'mdCP/0wPYS0O955JefrlHpVGw+0Qc98NQLyp6ue4ums=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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