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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c8860aa9c4d77e926fca2aa0d2b98d6aff9a2f9fb32f530b14d93406d22ed10b' 
  AND token = '08LGefPjILuNo5pLamXj/cTJX2AXPx6rVLfpyZxJ+Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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