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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4608dc06a97fb71c44710bfdda5090003bdc766b5056afc8beb146839fc59511' 
  AND token = 'xQtWO9tr+2WNCjpCoCtzVnryiTuhAVUOcxE1f8Vk7xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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